Send expiration notification emails; sent at 12:00, Days before the expiration; 14,10,5,3,2,1

Advanced, 2-Step Verification,

Enforce 2-step verification for the following users, all users

Control Panel, Terminal & SNMP, Terminal:

(in case) SSH service, advanced settings, High

Control Panel, Security, Security:

Improve protection against cross-site request forgery attacks

Improve security with HTTP Content Security Policy (CSP) header.

Do not allow DSM to be embedded with iFrame.

Clear all saved user login sessions upon system restart.

Control Panel, Security,Firewall:

consider enabling firewall which depends on the IT infrastructure. Firewall rules can be enabled for VPN services which can improve security or protect a access for Hyperbackup. This can be implemented with an allow and deny rule for certain services.

For adding special symbols under Mac OS X like m² and m³ this is possible via show Emoji & Symbols. This option can be found under the flag in the menubar. You must activate system preferences, keyboard, show keyboard, emoji, symbol viewers in menu bar. To see the flag go to system preferences, keyboard, input sources show input menu in menu bar.

To add the symbols m² and m³ search under Emoji & Symbols to 2 or 3. Here you can add ² and ³. You add this symbols in Mail or Libre Office